Interface marketing leans on the numbers that are cheapest to improve. Sample rate and bit depth
print well on a box. Preamp headroom and driver stability do not, and those are the ones you will
still be living with in five years.

Preamps: gain range and headroom

A dynamic microphone on a quiet source can need 60 dB of clean gain. Interfaces that top out
near 50 dB force you to push the preamp into its noisy region, and no amount of post-processing
puts that noise floor back. Check the maximum gain figure and the equivalent input noise (EIN)
spec together — high gain with poor EIN is a hiss generator.

Headroom matters at the other end. A drum room mic or a loud guitar cabinet will slam an input
that clips at low levels, and digital clipping is not the forgiving kind.

Latency is a driver problem, not a spec sheet problem

Round-trip latency depends on buffer size, driver quality, and your computer, not on the price
of the box. On Windows, a native ASIO driver written by the manufacturer is the single biggest
predictor of whether you can track at a 64-sample buffer without crackles. Generic driver
wrappers are where cheap interfaces fall apart.

Direct monitoring sidesteps the issue for tracking: the input signal is routed to your
headphones in hardware, before the computer ever sees it. If you record vocals, treat this as
mandatory rather than a bonus feature.

I/O count: buy for the session after next

Two inputs cover a songwriter. A drum kit needs eight and will happily take twelve. The
upgrade path that avoids replacing the whole unit is ADAT optical input — it adds eight channels
from an external preamp over one cable. An interface with ADAT expansion at 2-in is a different
purchase from one without, even if today you only ever plug in a single microphone.

What matters less than the marketing suggests

• Sample rates above 96 kHz. Bigger files, more CPU load, no audible gain for
  most music production. 48 kHz is the working standard for a reason.
• Bundled plugin packages. Pleasant, but they expire, change owners, and
  should never decide the hardware.
• Bus power vs external power. External supplies are steadier for high-gain
  work, but a well-designed bus-powered unit is fine for two channels.

Frequently asked questions

Is USB-C faster than USB-B for audio?

The connector shape is not the bottleneck. Audio bandwidth needs are tiny compared to the bus;
driver quality determines performance.

Do I need phantom power?

Yes if you own or plan to own a condenser microphone. Nearly every interface supplies 48V, but
check that it can be switched per channel if you mix ribbon and condenser mics.

Will a better interface make my recordings sound better?

Less than a better microphone, a better room, or a better performance. It removes ceilings
rather than adding quality.